Test Calculator

by
Test Grade Calculator
Standard (10-point scale)Plus/Minus Scale
Results:
90%
Grade: A
Score: 45 out of 50 correct
function calculateTestGrade(){var total=parseFloat(document.getElementById('totalQuestions').value);var wrong=parseFloat(document.getElementById('wrongAnswers').value);var scale=document.getElementById('grading_scale').value;if(isNaN(total)||isNaN(wrong)||totaltotal){alert('Number of wrong answers cannot exceed total questions.');return;}var correct=total-wrong;var percent=(correct/total)*100;var letter='F';if(scale==='standard'){if(percent>=90)letter='A';else if(percent>=80)letter='B';else if(percent>=70)letter='C';else if(percent>=60)letter='D';}else{if(percent>=97)letter='A+';else if(percent>=93)letter='A';else if(percent>=90)letter='A-';else if(percent>=87)letter='B+';else if(percent>=83)letter='B';else if(percent>=80)letter='B-';else if(percent>=77)letter='C+';else if(percent>=73)letter='C';else if(percent>=70)letter='C-';else if(percent>=67)letter='D+';else if(percent>=63)letter='D';else if(percent>=60)letter='D-';}document.getElementById('finalPercent').innerHTML=percent.toFixed(1);document.getElementById('letterGrade').innerHTML=letter;document.getElementById('correctCount').innerHTML=correct;document.getElementById('totalDisplay').innerHTML=total;if(document.getElementById('showTable').checked){var html='';for(var i=0;i<=Math.min(total,10);i++){var p=((total-i)/total)*100;html+='';}html+='
WrongGradePercent
'+i+''+(total-i)+'/'+total+''+p.toFixed(1)+'%
';document.getElementById('gradeChart').innerHTML=html;document.getElementById('gradeChart').style.display='block';}else{document.getElementById('gradeChart').style.display='none';}}

Calculator Use

This test calculator is designed to help teachers, students, and parents quickly determine the grade on any exam or quiz. By entering the total number of questions and the number of incorrect answers, you can instantly see the percentage score and the corresponding letter grade.

Whether you are grading a simple 10-question quiz or a massive 200-question final exam, this tool provides precise calculations. It supports both a standard 10-point scale and a more detailed plus/minus college-level scale.

Total Number of Questions
The absolute count of all possible items or points on the assessment.
Number of Wrong Answers
The number of items the student did not answer correctly.
Grading Scale
The system used to convert a numerical percentage into a letter grade (e.g., A, B, C).

How It Works

The math behind the test calculator is straightforward but vital for academic accuracy. The calculator determines the ratio of correct answers to the total opportunities and multiplies by 100 to get a percentage.

Grade Percentage = ((Total Questions – Number Wrong) / Total Questions) × 100

Once the percentage is calculated, the tool looks up the value in the selected grading scale table. For example, in a standard scale, a 90% is often the threshold for an "A".

  • Step 1: Subtraction of wrong answers from total to find the "Raw Score."
  • Step 2: Division of the Raw Score by the Total Questions.
  • Step 3: Conversion to a percentage (multiplying by 100).
  • Step 4: Assignment of the letter grade based on institutional standards.

Calculation Example

Example: A student takes a midterm exam consisting of 65 questions. They missed 8 questions. What is their final score?

Step-by-step solution:

  1. Total Questions = 65
  2. Number Wrong = 8
  3. Correct Answers = 65 – 8 = 57
  4. Calculation: (57 / 65) = 0.8769
  5. Percentage: 0.8769 × 100 = 87.7%
  6. Result: 87.7% (B+ on many scales)

Common Questions

How do I calculate a grade if some questions are worth more points?

In cases where questions have weighted values, you should treat the "Total Questions" as "Total Possible Points" and the "Number Wrong" as "Points Lost." The formula remains identical: (Earned Points / Total Points) × 100.

What is a passing grade?

In most United States educational institutions, a 60% or 65% is considered the minimum passing grade (a "D"). However, in many collegiate programs or professional certifications, a passing grade might be set as high as 70% or 75%.

Can this test calculator handle curves?

This tool calculates the raw percentage score. If a teacher "curves" a test by adding 5 points to everyone's score, you would simply add 5 to the percentage result provided here. To calculate a "Square Root Curve," take the square root of the percentage and multiply by 10.

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